FloatingActionButton和CoordinatorLayout布局问题

Question

android:id="@+id/coordinator_layout"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MyActivity">

<TextView
    android:background="#ffe243ce"
    android:id="@+id/activity_transition_header"
    android:text="10:10"
    android:textColor="@android:color/white"
    android:textSize="100dp"
    android:gravity="center"
    android:layout_width="match_parent"
    android:layout_height="144dp"
    android:transitionName="clock"
    />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_marginTop="118dp"
    android:layout_marginRight="16dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:backgroundTint="#30469b"
    android:transitionName="fab"
    android:stateListAnimator="@anim/fab_anim"
    app:borderWidth="0dp"
    app:elevation="6dp"
    app:fabSize="normal"
    app:layout_anchor="@id/coordinator_layout"
    app:layout_anchorGravity="right"
    app:pressedTranslationZ="12dp"
    app:rippleColor="#a6a6a6" />

<RelativeLayout
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_horizontal_margin"
    android:layout_below="@id/activity_transition_header">

</RelativeLayout>

只要我把最后一个布局中的android:id="@+id/container"给添加上，程序就会出现莫名奇妙的错误（一个和这个layout文件无关的recyclerView空引用错误）。请问这是为什么？屏蔽掉这一句就好了，没有错误出现

Answer 1

http://www.open-open.com/lib/view/open1437312265428.html